exam Maths Puzzle Numerical Ability

How do you complete the square for (((2x^2+3x+4=0)))?

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I'm stuck again:

"graph the equation; calculate the slope, x-intercept and y-intercept and label the intercepts on the graph"
y=-2-7

Thanks! How do you do the following?
x2-7x+10=0
x2+5x+6=0
x2-3x-4+0
y2+2y-8=0